The history of “Viagra” was started in 1992 in the UK, in the town of Sandwich Pfizers in the course of pharmaceutical research company “Pfizer”. The researchers conducted clinical tests of a new drug – sildenafil citrate, which was developed as a means to treat certain heart ailments. Scientists had hoped that sildenafil citrate will increase the blood flow to the heart muscle and reduce blood pressure. However, it was observed that sildenafil citrate does not significantly influence neither on blood circulation to the heart muscle (myocardium), or on blood pressure. In parallel, revealed that many male patients who participated in the study refused to return the tablets of sildenafil, despite the end of testing. The reason for failure in all these patients had one – they all pointed at a sharp improvement in the quality of erections. Thus, despite the minimal impact of new drugs on blood circulation in the myocardium, sildenafil caused a significant blood flow to male genitals.

Researchers at pharmaceutical company “Pfizer” reacted to this unexpected property of sildenafil citrate with due diligence and failed to recognize in it a powerful tool to combat erectile dysfunction. The new drug called “Viagra” – the name was born as a result of the merger in the words «Vigor» (power, energy, force) and the Niagara – the most powerful waterfall in North America.

Since 1993 began long clinical trials needed to confirm the properties of “Viagra”. As a result of these tests proved the high effectiveness of “Viagra” for impotence treatment and high safety of this drug. And as a logical final – March 27, 1998, the Department by the U.S. Food and Drug Administration approved the use of “Viagra”.

Viagra is a drug for the treatment of erectile dysfunction. It acts on the natural mechanisms of erection and helps man to cause an erection. Suitable for men suffering from erectile dysfunction of various origins (disease, nerve damage erection).

Information for patients:

What is Viagra?

The drug Viagra is the first pharmaceutical agent which exhibits a significant and reliable efficacy in most men with erectile dysfunction. Viagra promotes natural response to sexual stimulation.

What is the mechanism of action of Viagra?

It is to increase the amount of blood flowing into the penis, which helps a man to call a natural erection. Viagra works only on natural mechanisms of erection and in this its undeniable novelty and secret huge popularity.

What is the effectiveness of Viagra?

Viagra has a fairly high efficiency. The effectiveness of Viagra to a great extent depends on the type of erectile dysfunction from associated diseases. If in vascular erectile dysfunction Viagra is quite effective, in the presence of pathological venous drainage results of Viagra is much worse.

Does Viagra increase a sexual desire?

The action of Viagra is based only on the local increase in blood flow in the cavernous body of penis, and it causes no increase sexual desire. Viagra does not increase libido and is not “exciting” tool.

Who should take Viagra?

Viagra is intender for use by men suffering from erectile dysfunction of various origins, including in lesions of blood vessels or nerves of the penis. An exception may be only a rough fibrosis corpus cavernosum of the penis.

How to define sexual norms?

Healthy is the one who appears and remains an erection, allowing him to engage in sexual intercourse and successfully complete them. If a person who considers himself healthy, takes Viagra and reveals improved erectile function, in fact he may well suffer some erectile dysfunction.

What should anyone to discuss with specialists about the drug?

It is recommended, consult a sex therapist or urologist. It is advisable that you also visited a cardiologist or internist to rule out heart disease. If you suffer from any chronic illness, you should contact the appropriate specialist.

How to take Viagra?

All you have to do is take one tablet of Viagra about an hour before sexual activity. After about 30-60 minutes of starting the drug and lasts for four hours. It is best to take Viagra before eating, as in this case it will be quicker. The action of Viagra is that you need to take it only when you want to make sexual intercourse. Viagra should not take more than once a day.

How to choose a right dose of Viagra?

Viagra comes in three standard dosages: 25, 50 and 100 mg. Normally, Viagra is assigned to an average dose – 50 mg, and then, depending on the coming (or coming) the effect of the dosage is adjusted. Another approach – to begin treatment with a minimum dosage, increasing it until a good therapeutic effect.

How safe is Viagra?

Clinical trials have proven the safety of Viagra. The frequency of discontinuation due to adverse events was comparable for patients receiving the drug (2.5%) or placebo (2.3%). However, the manifestation of some known drug interactions, especially with nitrates used in the treatment of heart disease. That is why Viagra is contraindicated in patients receiving treatment with nitrates (nitroglycerin, isosorbide dinitrate, isosorbide mononitrate, etc.). Any man who takes nitrates of any kind at any time (usually take nitrates for angina – chest pain caused by heart disease) should not take Viagra. The danger is a possible significant drop in blood pressure.

Who should take Viagra with caution?

First of all, people with serious diseases of the cardiovascular system: heart failure, angina, cerebral blood flow (heart pain with fizichekoy load or at rest, impaired memory and mental performance). In this case, you should consult your doctor about the advisability of taking Viagra. Increased caution is necessary in patients who have previously occurred priapism (abnormal condition characterized by the appearance of an erection, which is not connected with erotic stimulation, and that could last for hours, causing severe pain in the penis). Patients who have a predisposition to the emergence of priapism requires medical supervision. Caution is necessary when taking Viagra people who are going to manage after receiving all sorts of machinery or vehicle, as approximately 2% of men after ingestion may occur rapidly undergoing change color vision with a predominance of blue flowers.

What should be expected during administration of Viagra?

There were no data for that long-term use of Viagra can cause some serious consequences. Existing to date knowledge about the drug can prescribe Viagra for both episodic and long-term treatment of erectile dysfunction. Recent studies (1,2) show that the majority of men with vascular erectile dysfunction during long-term (one year) regular use of Viagra (2 times a week to daily administration, regardless of sexual activity), erectile function returns to normal. The positive therapeutic effect persists after treatment. Established well tolerated long-term use of Viagra in patients with erectile dysfunction.

Does Viagra affect on ability to bear children?

Viagra has no effect on fertility. However, in cases where violations of erection impede fertility in couples of childbearing age, Viagra may be helpful.

Does Viagra influence on fertility?

To date, absolutely proven that the lack of effect of Viagra on fertility. It was found that Viagra has no effect on semen quality nor the quantity and activity of sperm in it.

How does Viagra work for healthy people?

The presence of blood in a certain concentration of Sildenafil may to some extent to accelerate the recovery of erection after orgasm. This is the so-called refractory period, which occurs in men after each orgasm and characterized by an inability to get an erection within a certain amount of time. Viagra can help you recover faster after orgasm for the next sexual intercourse.

How to take Viagra if I am old men?

The only thing you should pay special attention – a state of heart. This is a recurring pain in his heart that accompany physical activity – whether it be climbing stairs, brisk walking. If you are really concerned about pain in the heart during exercise, before taking Viagra, it is strongly advised to consult a cardiologist.

As far as Viagra is effective for women?

Viagra is designed for men and women to receive non-recommended.

What if Viagra does not help all the same to you?

Options approach to the treatment of erectile dysfunction are many. Viagra – no doubt a great product, but this is not the only possible treatment options. Refer to a specialist.

How can you distinguish counterfeit Viagra?

The basic rule that can protect you from buying a fake – buy the drug only in pharmacies, which are officially registered and have official license to sell pharmaceuticals.